During the operations of the TL 3000 Sirius fleet, it was found that by inaccurate use of the flaps, a damage of the servo-motor could occur. This condition can only take place in aircraft equipped with the flap control system unit - Flopcontrol.

With an inaccurate rotation of the flap control handle, where the handle moves outside of the firmly set positions (flap closed, take-off position and landing), the end sensors of the flap control servo-motor be come inactive. The servo-motor is then ejected outside of its position limits, becomes overloaded and subsequently its damage will occur. This condition can be eliminated by inserting a fuse into the electrical circuit of the flap control system unit, which will, in case of the overload, cut off the power supply to the servo-motor.

Following the adjustment of the flap control handle into one of the set correct positions and pushing in of the fuse, complete flap control system unit function will be renewed. The objective of the above modification is to prevent the flap control servo-motor damage and the subsequent need for its costly replacement. This Service Bulletin describes the procedure of the flap control electrical circuit modification, so that it can be performed independently by the aircraft operators.

The 7,5 A fuse can be obtained in the place of the aircraft operations or via contacting the manufacturer TL-ULTRALIGHT. Upon written request with stated delivery address and upon the payment of cost, the fuse will be distributed by the manufacturer. In case of not complying with this bulletin, the manufacturer reserves the right to not accept any servomotor damage claims or any further damage claims, resulting from not complying with this bulletin.

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• bulletin-1.-s.-si.-2014_klapky-flopcontrol_en.pdf (PDF 4.56 MB)

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